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AD5542ARZ Datasheet(PDF) 10 Page - Analog Devices |
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AD5542ARZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 20 page AD5541/AD5542 Data Sheet Rev. F | Page 10 of 20 TERMINOLOGY Relative Accuracy or Integral Nonlinearity (INL) For the DAC, relative accuracy or INL is a measure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. A typical INL vs. code plot can be seen in Figure 6. Differential Nonlinearity (DNL) DNL is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures mono- tonicity. Figure 9 illustrates a typical DNL vs. code plot. Gain Error Gain error is the difference between the actual and ideal analog output range, expressed as a percent of the full-scale range. It is the deviation in slope of the DAC transfer characteristic from ideal. Gain Error Temperature Coefficient Gain error temperature coefficient is a measure of the change in gain error with changes in temperature. It is expressed in ppm/°C. Zero Code Error Zero code error is a measure of the output error when zero code is loaded to the DAC register. Zero Code Temperature Coefficient This is a measure of the change in zero code error with a change in temperature. It is expressed in mV/°C. Digital-to-Analog Glitch Impulse Digital-to-analog glitch impulse is the impulse injected into the analog output when the input code in the DAC register changes state. It is normally specified as the area of the glitch in nV-sec and is measured when the digital input code is changed by 1 LSB at the major carry transition. A plot of the digital-to- analog glitch impulse is shown in Figure 19. Digital Feedthrough Digital feedthrough is a measure of the impulse injected into the analog output of the DAC from the digital inputs of the DAC, but it is measured when the DAC output is not updated. CS is held high while the CLK and DIN signals are toggled. It is specified in nV-sec and is measured with a full-scale code change on the data bus, that is, from all 0s to all 1s and vice versa. A typical plot of digital feedthrough is shown in Figure 18. Power Supply Rejection Ratio (PSRR) PSRR indicates how the output of the DAC is affected by changes in the power supply voltage. Power-supply rejection ratio is quoted in terms of percent change in output per percent change in VDD for full-scale output of the DAC. VDD is varied by ±10%. Reference Feedthrough Reference feedthrough is a measure of the feedthrough from the VREF input to the DAC output when the DAC is loaded with all 0s. A 100 kHz, 1 V p-p is applied to VREF. Reference feedthrough is expressed in mV p-p. |
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